package com.atguigu.educenter.controller;


import com.atguigu.commonutils.JwtUtils;
import com.atguigu.educenter.entity.UcenterMember;
import com.atguigu.educenter.service.UcenterMemberService;
import com.atguigu.educenter.utils.ConstantWxUtils;
import com.atguigu.educenter.utils.HttpClientUtils;
import com.atguigu.servicebase.exceptionhandler.GuliException;
import com.google.gson.Gson;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;

@Controller//只是请求地址，不需要返回数据
@CrossOrigin
@RequestMapping("/api/ucenter/wx")
public class WxApiController {

    @Autowired
    private UcenterMemberService memberService;

    //获取扫描人信息，添加数据
    @GetMapping("callback")
    public String callback(String code ,String state){
        try {
            //1.获取code值，临时票据，类似于验证码

            //2.拿着code请求   微信固定的地址，得到两个值 accsess_token和openid
            //向认证服务器发送请求换取access_token

            String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
            "?appid=%s" +
            "&secret=%s" +
            "&code=%s" +
            "&grant_type=authorization_code";

            //拼接三个参数: id 秘钥和 code值
            String accessTokenUrl = String.format(
                    baseAccessTokenUrl,
                    ConstantWxUtils.WX_OPEN_APP_ID,
                    ConstantWxUtils.WX_OPEN_APP_SECRET,
                    code
            );

            //请求这个拼接好的地址，得到返回两个值 accesss_token 和openid
            //使用httpClient发送请求 ，得到返回结果
            String assessTokenInfo = HttpClientUtils.get(accessTokenUrl);


            //从accessTokenInfo字符串获取出来两个值 access_token 和openid
            //把accessTokenInfo字符串转换map集合，根据map里面key获取对应值
            //使用json转换工具
            Gson gson = new Gson();
            HashMap map = gson.fromJson(assessTokenInfo, HashMap.class);
            String access_token = (String)map.get("access_token");
            String openid = (String)map.get("openid");



            //把扫描人信息添加到数据库
            //判断数据表里面是否存在相同微信信息  根据openid判断
            UcenterMember member =memberService.getOpenIdMember(openid);
            if(member==null){//menber是空 ，表没有相同微信数据，进行添加



                //3.拿着得到access_token 和openid ，再去请求微信提供固定地址，获取到扫描人的信息
                //访问微信的资源服务器，获取用户信息
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";
                //拼接两个参数
                String userInfoUrl=String.format(
                        baseUserInfoUrl,
                        access_token,
                        openid
                );
                //发送请求
                String userInfo = HttpClientUtils.get(userInfoUrl);
                HashMap userInfoMap = gson.fromJson(userInfo, HashMap.class);
                String nickname = (String)userInfoMap.get("nickname");
                String headimgurl = (String)userInfoMap.get("headimgurl");


                member=new UcenterMember();
                member.setOpenid(openid);//openid
                member.setNickname(nickname);//昵称
                member.setAvatar(headimgurl);//头像
                memberService.save(member);
            }

            //使用jwt根据menber对象生成token字符串
            String jwtToken = JwtUtils.getJwtToken(member.getId(), member.getNickname());

            //最后：返回首页面,通过路径传递token字符串
            return "redirect:http://localhost:3000?token="+jwtToken;
        } catch (Exception e) {
            e.printStackTrace();
            throw new GuliException(20001,"登录失败");
        }

    }



    //1.生成微信扫描的二维码
    @GetMapping("login")
    public String getWxCode(){

        //固定地址,后面拼接参数
        //第一种做法就是在后面完成拼接传递参数
//        String url="https://open.weixin.qq.com/connect/qrconnect?appid=" +
//                ""+ ConstantWxUtils.WX_OPEN_APP_ID+"&response_type=code";


        //微信开放平台授权baseUrl   %s相当于?代表占位符
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
                "?appid=%s" +
                "&redirect_uri=%s" +
                "&response_type=code" +
                "&scope=snsapi_login" +
                "&state=%s" +
                "#wechat_redirect";

        //对redirect_url进行URLEncoder编码
        String redirectUrl=ConstantWxUtils.WX_OPEN_REDIRECT_URL;
        try {
            redirectUrl= URLEncoder.encode(redirectUrl,"utf-8");
        } catch (Exception e) {
            e.printStackTrace();
        }


        //设置%s里面值
        String url=String.format(
                baseUrl,
                ConstantWxUtils.WX_OPEN_APP_ID,
                redirectUrl,
                "atguigu"
        );

        //重定向到请求微信的地址里面
        //redirect:重定向
        return "redirect:"+url;
    }

}
